This seems to have happened a couple times now. Git wraps first commit lines early, and has a 72-char hard limit. This wrapping sometimes leaves the r?foo off the first line, and it doesn't get picked up by hg push review integration. To get around this, I tried starting commits with r?foo, but this seems to (sometimes?) not work.
The final commit here did not pick up the start-of-line "r?jrmuizel": https://bugzilla.mozilla.org/show_bug.cgi?id=1262265
FWIW, the workaround I'm using now is to include a leading space: " r?foo - blah blah blah"
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